【C++】時間取得のてすと

cpp_time_test.cpp

#include <iostream>
#include <ctime>
#include <thread>
#include <iomanip>

void sleep(unsigned long sleep_time)
{
    std::chrono::milliseconds duration(sleep_time);
    std::this_thread::sleep_for(duration);
}

//! get GMT.
inline std::time_t getGMT() {
    return std::time(nullptr);
}

//! get local time.
inline std::time_t getLocalTime() {
    std::time_t tt = std::time(nullptr);
    struct tm *tinfo = std::localtime(&tt);
    return mktime(tinfo);
}

int main()
{
    std::time_t t = std::time(nullptr);
    std::cout << " UTC : " << std::put_time(std::gmtime(&t), "%c %Z") << std::endl;
    std::cout << "     t = " << t << std::endl;
    std::cout << "getGMT = " << getGMT() << std::endl;
    std::cout << "local: " << std::put_time(std::localtime(&t), "%c %Z") << std::endl;
    std::cout << "           t = " << t << std::endl;
    std::cout << "getLocalTime = " << getLocalTime() << std::endl;


    std::time_t tt = std::time(nullptr);
    std::cout << "------------" << std::endl;
    std::cout << "std::time(nullptr) = " << tt << std::endl;
    std::gmtime(&tt);
    std::cout << "std::gmtime(&tt)   = " << tt << std::endl;

    return 0;
}